1368639139 has 12 divisors (see below), whose sum is σ = 1635122064. Its totient is φ = 1141411824.

The previous prime is 1368639109. The next prime is 1368639143. The reversal of 1368639139 is 9319368631.

It is not a de Polignac number, because 1368639139 - 2⁷ = 1368639011 is a prime.

It is a super-2 number, since 2×1368639139² = 3746346185605322642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1368639092 and 1368639101.

It is not an unprimeable number, because it can be changed into a prime (1368639109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375639 + ... + 379264.

It is an arithmetic number, because the mean of its divisors is an integer number (136260172).

Almost surely, 2^1368639139 is an apocalyptic number.

1368639139 is a deficient number, since it is larger than the sum of its proper divisors (266482925).

1368639139 is an equidigital number, since it uses as much as digits as its factorization.

1368639139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754954 (or 754947 counting only the distinct ones).

The product of its digits is 629856, while the sum is 49.

The square root of 1368639139 is about 36995.1231786029. The cubic root of 1368639139 is about 1110.2726757534.

It can be divided in two parts, 13686 and 39139, that added together give a palindrome (52825).

The spelling of 1368639139 in words is "one billion, three hundred sixty-eight million, six hundred thirty-nine thousand, one hundred thirty-nine".